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2 Sheets-Sheet 1.

(No Model.)

0. .G'O'ERPER. DYNAMO ELECTRIC MACHINE.

Patented Apr. 28, 1 889.

/A/ VE/VTOR A TIM/VH5 WITNESSES (No Model.) 2 Sheets-Sheet 2.

O. GOERPER.

DYNAMO ELECTRIC MACHINE. No. 402,066. Patented Apr. 23, 1889.

M98 M28 SL540.

WITNESSES: INVENTOR N PETERS, Phem-Lmm m ppp r, WzxshlnalcmQC UNITEDSTATES PATENT OFFICE.

CARL COERPER, OF EIIRENFELD, NEAR COLOGNE-ON-TIIE-RHINE, PRUSSIA,

GERMANY, ASSIGNOR TO THE HELIOS ACTIEN-GESELLSCIIAFT FER ELEK- TRISCIIESLICIIT UND TELEGRAPHENBAI OF SAIWIE PLACE.

DYNAMO-ELECTRIC MACHINE.

SPECIFICATION forming part of Letters Patent No. 402,066, dated April23, 1889.

Application filed July 19,1887. Serial No. 244,717. (No model.) Patentedin France June 22, 1887,1I0. 184,384; in England June 2 1, 1887, No.9,013; in Belgium June 28, 1887,1I0. 77,982, and in Italy August 31,1887, XXI, 21,986, XLIII, 352.

To all whom it may concern;-

Be it known that I, CARL CQERPER, a subject of the King of Prussia,Germany, resid-' ing at the city of Ehrenfeld, near Cologne-on- 5the-Rhine, in the Kingdom of Prussia, Germany, have invented certain newand useful Improvements in Dynamo-Mac]lines, (which heretofore werepatented to me by the governments of England, dated June 24, 1887, No.

9,013; Italy, dated August 31,1887, Vol. XXI, No. 21,986, and Vol.XLIILNo. 352; Belgium, dated June 28, 1887, No. 77,982, and France,dated June 92,1887,No. 1 8438%) of which the following is aspecification.

T 5 In case dynamo-electric machines are used for transmitting power bymeans of alternating currents, the masses of iron are heated to quite ahigh degree by the repeated changes of polarization. As long as thedynamo-machine is not working with its full or normal revolutions, whichis always the case in the beginning of the operation. or when themachine is subjected to a greater strain than it is adapted to, thesechanges of current affect 2 5 the field-magnets as well as the armature.This causes heating and consequent loss of power.

The object of my invention is to reduce this heating and. consequentloss of power to a minimum, which I obtain by making the cores of thefieldanagnets as well as of the armature of a series of thicknesses ofsheet-iron, which are placed side-by side and united by suitabledevices, said pieces 01' sheet metal 3 5 having notches to receive thewires.

The invention also consists in the construction and combination of partsand details, as will be fully described and set forth hereinafter, andfinally pointed out in. the claims.

4 I11 the accompanying drawings, Fign re 1 is a side view 01' anexternal field-magnet and internal armature made according to myimproved method, the wire being partly omitted. Fig. 2 is an end view ofan external armature and an internal field-magnet made according to myimproved method. Fig. 8 an end view of an external field-magnet withinternal armature of: my lTHPI'OYGLl construction.

Fig.1 is an end view of the external armature and internal field-magnetof my improved construction. Fig. 5 is a cross-sectional view of myimproved field-magnet and internal ar mature. Figs. (5 and '7 are sideviews of afieldmagnet and armature side by side. Figs. 8, 9, and 10 aredetail vie showing the manner of forming the notches in the plates.Figs. 11, 12, and 13 are detail cross-sectional views showing thenotches in the plates, the wires in the notches, and theinsulating-pieces surrounding the wires. 6o

Similar letters of reference indicate corresponding parts.

The cores for the fiehl-magnets A and for the armature 13 are composedof a series of sheetiron rings, 0, Fig. 5, placed side by side and 6 5held together by bolts f, passed transversely through the severalthicknesses of sheet-iron or said several thicknesses of sheet-iron canbe held together by any suitable clamping devices.

As shown in Fig. 1, the core A. for the fieldmagnet is provided in itsinner edge or side with notches or recesses for receiving the wires,said notches or recesses being provided in the sheet-iron rings beforethe same are 7 united. The core I; for the armature is provided in itsedges with like notches for re ceiving the wires.

As shown in Fig. 2, the notches of the armature are on the inside andthe notches for the field-magnet are on the outside.

As shown in. Fig. 3, the notches of the field magnet are on the insideand those of the ar mature-core on the outside, the notches of the fielde magnet core and armature being of about the same size.

As shown in Fig. I, the core of the fieldmagnet is constructed withradial arms, around which the wires are wound, said core being alsocomposed of layers of sheet metal. In 0 place of forming the said coreof sheetmetal side by side, it may be formed in the shape of concentricrings, on which the wires are wound, as in Figs. 6 and 7 In Fig. 6 anarmature B is shown between two field-magnets A, and in Fig. '7 thearmacure-core B is shown at one side of the fieldmagnet core A. Asstated, all these cores are provided with notches on which the wires arewound, as in the Weston machine. This construction to a certain extentis defective, especially when the armature is on the inside, as thewires are apt to spread outward, and it is very difficult for them to beheld in place, and it is also more or less diflicult to wind them on thecore. The sheet-metal teeth between the notches are decreased in sizeconsiderably and theeffectiveness of the machine is decreased. In orderto avoid these defects, the notches are formed as shown in Figs. 9 and10that is, they are widened a short distance back of the edge, so thatthe notches serve to retain the wireswhile the tooth portion between thenotches is enlarged, as is also the space for the wires. Tongues d dproject toward each other at the open ends of the notches, and thedistance between the adjacent ends of said tongues is of such size thata wire can easily be passed in between them. A piece, I), of insulatingmaterial is placed in the notch, and into this insulatingpiece the wiresa a are passed, and then a cross-piece, c, is inserted between the inneredges of the tongues d d and the outer ends of the pieces of insulatingmaterial 17, as shown in Fig. 11.

If desired, notches e 6 may be formed at the inner edges of the tonguesd d for receiving the ends of the piece 0, as shown in Fig. 12,

' whereby said pieces are held more securely in position. I

As shown in Fig. 11, the tongues d d are flush with the inside of theinsulating-piece b, and a short distance from the edge of the same, thespace between the same forming a notch for receiving a piece, 0, forholding the wires in place.

As shown in Fig. 13, the width of the notch A is the same throughout.

As shown in Figs. 11, 12, and 13, the notches may be made for two ormore wires, as may be required. I

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. In a dynamo-electric machine, an armature-coreprovided with notches for receiving the wires, tongues projecting towardeach other at the open ends of said notches, and cross-pieces supportedby said tongues, substantially as shown and described.

2. In a dynamo-electric machine, an armature-core having notches in itsrim, which notches have their width increased a short distance fromtheir outer ends, and insulatingpieces in said notches, whichinsulating-pieces serve for receiving the wires, substantially asShownand described.

3. In a dynamo-electric machine, the combination, with an armature-coreprovided with notches, of insulating-pieces in said notches, tongues atthe open ends of said notches, and cross-pieces for retaining the wiresin place in the insulating-pieces, substantially as shown and described.

4. In a dynamo-electric machine, the combination, with an armature corehaving notches and tongues at the outer ends of said notches, ofinsulating-pieces in said notches, and cross-pieces at the open ends ofthe notches for retaining the wires in place in the notches, saidcross-pieces resting on the inner edges of the tongues, substantially asshown and described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

' CARL COERPER.

Witnesses:

E. KocH, E. SCHWABE,

Both of Ehrenfeld.

